<script>
  var arr = ['hello', 'JavaScript', 22.48, true];
  console.log(arr[0]);
  console.log(arr[2]);
  console.log(arr);
</script>
<p>
  <a href="file:///C:/Users/rise/Desktop/%E9%A6%96%E9%A1%B5/default/03.html">返回</a>
</p>